package demo4.mapper;

import demo4.pojo.User;
import demo4.util.IDBUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import java.sql.*;
import java.util.ArrayList;
import java.util.List;

@Component
public class UserMapper implements IUserMapper {
    @Autowired
    private IDBUtil dbUtil;

    @Override
    public int insertUser(User user) {
        System.out.println("UserMapper:将用户信息插入到数据库中...");
        try (Connection connection = dbUtil.getConnection()) {
            String sql = "INSERT INTO user(username,password,nickname,age) " +
                    "VALUES(?,?,?,?)";
            PreparedStatement ps = connection.prepareStatement(sql);
            ps.setString(1, user.getUsername());
            ps.setString(2, user.getPassword());
            ps.setString(3, user.getNickname());
            ps.setInt(4, user.getAge());
            return ps.executeUpdate();


        } catch (SQLException e) {
            e.printStackTrace();
        }
        return 0;
    }

    @Override
    public User selectUserByUsername(String username) {
        try (Connection connection = dbUtil.getConnection()) {
            String sql = "SELECT id,username,password,nickname,age " +
                    "FROM user " +
                    "WHERE username = ?";
            PreparedStatement ps = connection.prepareStatement(sql);
            ps.setString(1, username);
            ResultSet rs = ps.executeQuery();
            if (rs.next()) {
                User user = new User();
                user.setId(rs.getInt("id"));
                user.setUsername(rs.getString("username"));
                user.setPassword(rs.getString("password"));
                user.setNickname(rs.getString("nickname"));
                user.setAge(rs.getInt("age"));
                return user;
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
    }

    public List<User> selectAllUser() {
        List<User> list = new ArrayList<>();
        try (Connection connection = dbUtil.getConnection()) {
            String sql = "SELECT id,username,password,nickname,age " +
                    "FROM user";
            Statement statement = connection.createStatement();
            ResultSet rs = statement.executeQuery(sql);
            while (rs.next()) {
                User user = new User();
                user.setId(rs.getInt("id"));
                user.setUsername(rs.getString("username"));
                user.setPassword(rs.getString("password"));
                user.setNickname(rs.getString("nickname"));
                user.setAge(rs.getInt("age"));
                list.add(user);
            }

        } catch (SQLException e) {
            e.printStackTrace();
        }
        return list;
    }
    public int updateUser(User user) {
        try (Connection connection = dbUtil.getConnection()) {
            //实际开发中，id永远也不会改变，所以id作为条件
            String sql = "UPDATE user " +
                    "SET username = ?,password = ?,nickname = ?,age = ? " +
                    "WHERE id = ?";
            PreparedStatement ps = connection.prepareStatement(sql);
            ps.setString(1, user.getUsername());
            ps.setString(2, user.getPassword());
            ps.setString(3, user.getNickname());
            ps.setInt(4, user.getAge());
            ps.setInt(5, user.getId());
            return ps.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return 0;
    }
}
